Okay thank you 4 your answers! Pretty interesting POVs... I had forgotten the fact that she dazzles everyone =P
What I had come up with was that if she was bitten, she'd have a reaction but the kind of reaction everyone has to a virus or an infection... crazy fever for a few days and then it's gone. Because she's stronger than a human but no as strong as a vampire. I didn't think it would turn her into a vampire... she'd be as she was before.
I also gave some more thought to the subject of Renesmee's chances on having children. I think I found a pretty good argument in favor of "she can". We should think about it from a different and simpler angle: who Renesmee comes from: Stephenie Meyer.
If there's a statement SM made throughout the series (other than Pay more attention to your dreams: they could make you a millionaire..) in that "everything is possible". It is possible for vampires to rebel against the monster in them and regain their humanity. It was possible for a vampire not only to resist his "cantante"'s song, but also to be near it, touch it, kiss it, marry it and have a child with it. When it seemed impossible to make it in that last final stand, there SM surprised us with "Super Shield Bella" and "Super Last-minute-revelation Alice".
So I guess we can say that we know enough about SM and how she writes by now. We know how she relates to her characters. We know she gives them happy endings, and she doesn't stop at just happy, she gives them the happiest (and if she doesn't she's restless and wants to write more about them, like with Leah). So considering the fact she loves Renesmee,
and she's one of her most precious characters, who she planned from the start and waited for her to come to life for years... how can we even doubt she wouldn't give her the happiest ending? SM has found a way around pretty much every obstacle that stood in the way of the characters in the world she created. So even if it not explained explicitely, even if maybe it is & we don't see it, even if she kept it to herself, there's just no way she would pair up Jacob & Nessie and not make it possible for them to have children.
The question about How that might take place is still pending, but we can't doubt they can
So what do you think? I'm sure I missed the most obvious thing and everything I just said is pointless! =P I do that a lot, like everytime I fight with my sister it goes like "Hey u stole my jeans!! I can't find them!!" "Look down, you're wearing them.